linux-kernel - Re: [PATCH 00/14] tracing: add compat syscall support v3

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Message-ID: <20100327045958.GQ7166@nowhere>
Date:	Sat, 27 Mar 2010 06:00:00 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Jason Baron <jbaron@...hat.com>
Cc:	mingo@...e.hu, rostedt@...dmis.org, linux-kernel@...r.kernel.org,
	laijs@...fujitsu.com, lizf@...fujitsu.com, hpa@...or.com,
	tglx@...utronix.de, mhiramat@...hat.com, heiko.carstens@...ibm.com,
	benh@...nel.crashing.org, davem@...emloft.net, lethal@...ux-sh.org,
	schwidefsky@...ibm.com, brueckner@...ux.vnet.ibm.com,
	tony.luck@...el.com
Subject: Re: [PATCH 00/14] tracing: add compat syscall support v3

On Tue, Mar 16, 2010 at 01:46:08PM -0400, Jason Baron wrote:
> Hi,
> 
> Re-post to add infrastructure for compat syscall event tracing support. This
> patch series also adds x86_64 arch specific support as an example consumer
> of the new infrastructure.
> 
> Arches can request compat syscall tracing by setting: 
> __HAVE_ARCH_FTRACE_COMPAT_SYSCALLS, if CONFIG_COMPAT and CONFIG_FTRACE_SYSCALLS
> are set. Arches then need to implement the following interfaces:
> 
> 1) int is_compat_task(void);
>   - most arches seem to have this already
> 2) unsigned long arch_compat_syscall_addr(int nr);
>   - returns a pointer to the compat syscall entry corresponding to syscall 'nr'
> 3) int NR_syscalls_compat;
>   - number of entries in the compat syscall table.
> 
> thanks,
> 
> -Jason
> 
> Changes in v3:
> 
>  - create a separate "compat_syscalls" event subsystem
>  - ARCH_COMPAT_SYSCALL_DEFINE#N() tacks "sys32" to start of syscall name
>  - COMPAT_SYSCALL_DEFINE#N() tacks "compat_sys" to start of syscall name
>  - both above macros create perf events as: [enter|exit]_compat_sys_blah
>  - non-compat syscall naming changes to: [enter|exit]_sys_blah
>  - removes any unreferenced compat syscalls from debugfs



Other than the small comments I had, it's a very nice stuff.
Just waiting for your next iteration before applying.

Thanks!

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